o1.mailer.glsondemand.com has no MX records.
Question and response
Question
dig o1.mailer.glsondemand.com. MX
Answer
The response has no answer records.
Authority
glsondemand.com. 3600 SOA ns37.domaincontrol.com. dns.jomax.net. 2025122705 28800 7200 604800 3600
Additional
. 0 OPT ; payload 1280, xrcode 0, version 0, flags 0